Weekend game deals: 33% off Dirt 3, Red Faction: Armageddon

Steam has discounted another batch of titles as part of its ongoing summer sale. The promotion is set to conclude this Sunday and if you've missed any major deals, there's a decent chance they'll reappear on the final day. As always, we've listed some of the most noteworthy bargains around today, including 75% off Mafia 2, 66% off Mass Effect 2, Fallout 3 and Splinter Cell: Conviction, as well as 33% off Dirt 3 and Red Faction: Armageddon. Meanwhile, Direct2Drive offers 50% off the original Guild Wars trilogy.